Dragonscale-Encrusted Longblade also this for a 1H sword would be acceptable and even nice as a match, it kind of shimmers the colors across the blade, and sheathes on the back which is an interesting feature for a 1H sword. Off-hand would be more complicated, and I'll be looking for something for that, and a dagger or two plus another sword if I can find one. (Though the longblade is my 100% match personal feelings.)

As far as I'm concerned the Icecrown Citadel staff is a 100% match, and the lightest blues on it complement the set, and also remember there's a lookalike on heroic mode if you happen to be dragged in on Heroic instead of normal 25 man!

DaggersNormal SoO Norushen's Shortblade A little bit on the pale side, but an option.Heroic SoO/Warforged: Rik'kal's Bloody Scalpel and Rik'kal's Bloody Scalpel might be too silver for your taste overall but the hilt areas match decently to the set and silver is a neutral which goes with everything.Electrowing Dagger Heroic Dragon Soul's Electrowing Dagger is beautiful with this set also very Warlock Thematic and matches the unfolding wings! Drops from Heroic Hagara as noted.Alysra's Razor From Heroic Firelands, keeping with the purple traditionAvool's Incendiary Shanker basically same model as above, but agility, feel free to use this instead if it drops first.Uhn'agh Fash, the Darkest Betrayal has a lot of silver, some purple fire, purple markings, and a very very warlocky feel.Elementium Shank for the ultimately lazy, a crafted item that could be a match if you like it. I find it acceptable. I'll probably go with Electrowing Dagger myself though for the wings. :P

I did find one, and rogues cry, cry, cry about the fact the illusions don't work, but the dagger's glow is SUITED to this set and the blade to our green fire...and it sheaths on the back. ^_^;Twinblade of the Hakkari may I present Twinblade of the Hakkari!

Thematic Warlock Daggers:

Other Swords:Very nice purple/blue (Comes also in Heroic Warforged) from Heroic SoO: Kil'ruk's Furious BladeEnchanted Shao-Tien Saber purple and silver, though more lavender, heroic SoO only also Warforged version available.Xifeng, Longblade of the Titanic Guardian Normal SoO, may be too pale of a blue glow and have too much gold, there are cloaks that could tie in the gold but you'd also need an offhand change to tie in the gold cloak (May I suggest Drape of the Violet Tower to tie in the gold/purple combos as your cloak with this weapon?) and weapon probably. (off-hand options to tie-in the gold color on the weapon: Festering Primordial Globule or perhaps Lei Shen's Orb of Command or maybe Bottle of Potent PotablesBottle of Potent Potables both are same model, one's HM one's normal mode. There may be others with similar tie-ins of purple/blue and gold but those are some ideas)Do-tharak, the Swordbreaker The main body color matches the top of the helm and several parts of the gear. Red gems match other parts. This is solid combination if you can get it to drop. It's a boss drop off any boss in Heroic ToT.Souldrinker Good old Heroic Souldrinker from Dragon Soul off of Madness of Deathwing, might be too plum-colored for you, but have a look and see if you like. It's brutal-looking on a caster.Maldo's Sword Cane Not a direct match to the neon blues, but instead to the muter purples of the set, and if you check same model as you'll find a host of 6 available BoP possible drops that you can acquire instead of hunting the auction house or praying for this BoE sword to drop for you. It's also a really attractive and Warlock-thematic caster sword. Good luck getting one of the 7 copies of this model if you choose this 1H sword as your sword mog!Soul Blade Unique modelled bind on equip str sword, unfortunately unlike the swordcane, so you'll have to pray for it on AH, or hope it drops for you and your friends. Also matches the more mute purple tones in the armor and the pale lighted portions.Bloodsurge, Kel'Thuzad's Blade of Agony heroic 25 Lich King's basic caster sword. Purple to match the brighter purple on the armor. Kind of glows brightly

Some other cloak possibles if you don't want to farm avengers of hyjal rep:Drape of the Skyborn (only if you have never turned in algalon's quest item in dalaran.)Loque'Nahak's Pelt On Equip/Transmog Effect: Aggro All Hunters in a 50,000 mile radius.Drape of the Skyherald 10 man algalon quest itemMantle of Desire if you haven't done the thrall cataclysm cloak questline, this is the closest match without farming the Avengers rep.Woundlicker Cover an option for you if you just want to buy it with gold when 6.0.0 goes live.

Demonology Felguard/Wrathguard Weapon Tips!Remember you need 2x for a Wrathguard!Torch of the Damned Torch of the Damned goes well with this set, and is what I'm personally attempting to get as another option is currently out of my reach.Gurthalak, Voice of the Deeps Always an option and a good way to annoy melee. 'NO FAIR YOUR WRATHGUARD HAS BETTER LOOKING WEAPONS THAN ME!" -lulzHammer of the Naaru this may be too pink, but there's just not a lot of purple/navy weapons out there for this set I've found so far.